PICO TA467 User manual

User’s guide
TA467
Insulation tester
www.picoauto.com

2 DO341-1
TA467 Insulation Tester User’s Guide
Copyright © 2020 Pico Technology Ltd. All rights reserved.
Contents
1. Description ................................................................................................................................ 3
2. Appearance ............................................................................................................................... 3
3. Symbols and annunciators....................................................................................................... 4
4. Operating instructions.............................................................................................................. 5
4.1. Safety instructions.................................................................................................................... 5
4.2. Measurements and tests ......................................................................................................... 5
4.2.1. DC voltage measurements....................................................................................................... 5
4.2.2. AC voltage measurements (frequency, duty cycle)................................................................ 6
4.2.3. mV voltage measurements...................................................................................................... 7
4.2.4. Resistance measurements ...................................................................................................... 7
4.2.5. DC current measurements....................................................................................................... 8
4.2.6. AC current measurements (frequency, duty cycle) ................................................................ 9
4.2.7. Continuity check ..................................................................................................................... 10
4.2.8. Diode test ................................................................................................................................ 10
4.2.9. Capacitance measurements.................................................................................................. 11
4.2.10. Temperature measurements.................................................................................................. 11
4.2.11. Frequency (duty cycle) measurements (electronic)............................................................. 12
4.2.12. % 4 - 20 mA measurements .................................................................................................. 12
4.2.13. Insulation resistance measurements.................................................................................... 13
4.3. Auto-ranging/manual range selection................................................................................... 16
4.4. MAX/MIN ................................................................................................................................ 16
4.5. Relative mode ......................................................................................................................... 16
4.6. Display backlight..................................................................................................................... 16
4.7. Hold ......................................................................................................................................... 17
4.8. Peak hold................................................................................................................................. 17
4.9. Data storage............................................................................................................................ 17
4.10. Data storage recall.................................................................................................................. 18
4.11. Clear all data ........................................................................................................................... 18
4.12. PC wireless communication ................................................................................................. 18
4.13. Sending stored data to the PC ............................................................................................... 18
4.14. SETUP (SET) ........................................................................................................................... 19
4.15. AC + DC ................................................................................................................................... 19
4.16. Low battery indication............................................................................................................ 19
4.17. Maintenance ........................................................................................................................... 20
4.17.1. Battery installation.................................................................................................................. 20
4.18. Technicalspecications......................................................................................................... 21

3
DO341-1
TA467 Insulation Tester User’s Guide
Copyright © 2020 Pico Technology Ltd. All rights reserved.
1. Description
The TA467 Insulation tester is specially designed for vehicles with on-board high voltagesand
conforms to EN61010 CAT III (1000 volts) and CAT IV (600 volts). The insulation test function
allows testing of the insulation of the high voltage wires found on high-voltage vehicles. It can be
used as a stand-alone device or linked wirelessly with a USB interface to a PC or laptop so you
can have the results graphed, saved or printed. In addition to the insulation test, it can be used to
test diodes and to measure AC/DC voltage, AC/DC current, resistance, capacitance, frequency
(electrical and electronic), duty cycle, continuity and thermocouple temperature. It can store and
recall data and features a waterproof, rugged design for heavy duty use.
2. Appearance
Controls and jacks
1. 40,000 count LCD display 9. mA, µA and Insulation - input jack
2. STORE, RECALL and < button 10. REL and + button
3. MAX/MIN and – button 11. HOLD, PeakHOLD and > button
4. RANGE and SETUP button 12. EXIT and AC+DC button
5. INSULATION TEST button 13. Backlight and USB button
6. MODE and LOCK button 14.V,Ω,,,,Hz%,Temp,and
Insulation+inputjack
7. Function switch 15. COM input jack
8. 10 A input jack
Note: The tilt stand and battery compartment are on the rear of the unit.
1
4
3
2
5
6
7
8
915
14
13
12
11
10

4 DO341-1
TA467 Insulation Tester User’s Guide
Copyright © 2020 Pico Technology Ltd. All rights reserved.
3. Symbols and annunciators
Continuity NO. Serial number
Diode test SSecond
Battery status SET Set up parameter
nNano (10-9) (capacitance) AC + DC Alternating current + direct current
µMicro (10-6) (amps, cap) TRMS True RMS
mMilli (10-3) (volts, amps) STO Store
AAmps RCL Recall
kKilo (103) (ohms) AUTO Autorange
FFarads (capacitance) Backlight
MMega (106) (ohms) PEAK Peak hold
ΩOhms VVolts
Hz Hertz (frequency) REL Relative
%Percent (duty ratio) AUTO Autoranging
AC Alternating current HOLD Display hold
DC Direct current °C Degrees Celsius
°F Degrees Fahrenheit MIN Minimum
MAX Maximum RF icon

5
DO341-1
TA467 Insulation Tester User’s Guide
Copyright © 2020 Pico Technology Ltd. All rights reserved.
4. Operating instructions
4.1. Safety instructions
WARNING
Risk of electrocution. High-voltage circuits, both AC and DC, are very dangerous and should be
measured with great care.
• Always turn the function switch to the OFF position when you finish using the insulation
tester.
• If OL appears in the display during a measurement, the value exceeds the range you have
selected and you need to change to a higher range.
Please refer to the complete safety information for this product, in the PicoScope®4225A and
4425A Automotive oscilloscope and accessories Safety Guide, before you use it.
4.2. Measurements and tests
4.2.1. DC voltage measurements
CAUTION
Do not measure DC voltages if a motor on the circuit is being switched ON or OFF. Large voltage
surges may occur which can damage the unit.
1. Set the function switch to the V DC position.
2. Insert the black test lead into the COM jack (negative). Insert
the red test lead into the Vjack (positive).
3. Touch the black test probe tip to the negative side of the
circuit and touch the red test probe tip to the positive side of
the circuit.
4. Read the voltage in the display.

6 DO341-1
TA467 Insulation Tester User’s Guide
Copyright © 2020 Pico Technology Ltd. All rights reserved.
4.2.2. AC voltage measurements (frequency, duty cycle)
WARNING
Risk of electrocution! The probe tips may not be long enough to reach the live parts inside some
240 V outlets for appliances, because the contacts are recessed deep in the outlets. As a result,
the reading may show 0 volts when the outlet actually has a voltage on it. Make sure that the
probe tips are touching the metal contacts inside the outlet before you assume that there is no
voltage present.
CAUTION
Do not measure AC voltages if a motor on the circuit is being switched ON or OFF. Large voltage
surges may occur which can damage the unit.
1. Set the function switch to the V AC position
2. Insert the black test lead into the COM jack (negative). Insert the
red test lead into the Vjack (positive).
3. Touch the black test probe tip to the neutral side of the circuit and
touch the red test probe tip to the hot side of the circuit.
4. Read the voltage in the main display and read the frequency in the
right auxiliary display.
5. Press and hold the MODE button for two seconds to switch to Hz.
6. Read the frequency in the main display.
7. Press the MODE again to read the % of duty cycle in the main
display.
8. Press EXIT
9. Press and hold the AC + DC button for two seconds to switch to
AC + DC.
10.Test AC and DC TRUE RMS.

7
DO341-1
TA467 Insulation Tester User’s Guide
Copyright © 2020 Pico Technology Ltd. All rights reserved.
4.2.3. mV voltage measurements
CAUTION
Do not measure mV voltages if a motor on the circuit is being switched ON or OFF. Large voltage
surges may occur which can damage the unit.
1. Set the function switch to the mV position.
2. Press the MODE button to indicate AC or DC OR while in AC
range press and hold the AC + DC button for two seconds to
switch to AC + DC.
3. Insert the black test lead into the COM jack (negative). Insert the
red test lead into the Vjack (positive).
4. Touch the black test probe tip to the negative side of the circuit
and touch the red test probe tip to the positive side of the circuit.
5. Read the mV voltage in the display.
4.2.4. Resistance measurements
WARNING
To avoid electric shock, disconnect all power to the unit under test and discharge all capacitors
before you take any resistance measurements.
1. Set the function switch to the Ωposition.
2. Insert the black lead into the COM jack (negative). Insert the red
lead into the Ωjack(positive).
3. Touch the test probe tips to the circuit or part you wish to check.
It is best to disconnect one side of the part you are testing to
avoid interference from both sides of the circuit.
4. Read the resistance in the display.

8 DO341-1
TA467 Insulation Tester User’s Guide
Copyright © 2020 Pico Technology Ltd. All rights reserved.
4.2.5. DC current measurements
WARNING
Risk of electrocution! The probe tips may not be long enough to reach the live parts inside some
240 V outlets for appliances, because the contacts are recessed deep in the outlets. As a result,
the reading may show 0 volts when the outlet actually has a voltage on it. Make sure that the
probe tips are touching the metal contacts inside the outlet before you assume that there is no
voltage present.
CAUTION
Do not capture 20 A current measurements for more than 30 seconds. Exceeding 30 seconds
may cause damage to the unit and/or to the test leads.
1. Insert the black test lead into the COMjack(negative).
2. Set the function switch to the required position and connect
the red test lead:
a. For current measurements up to 4000 µA DC: Set the
function switch to the µA position and insert the red test
lead into the µA mA jack.
b. For current measurements up to 400 mA DC: Set the
function switch to the mA position and insert the red test
lead into the µA mA jack.
c. For current measurements up to 20 A DC: Set the function
switch to the 10A position and insert the red test lead into
the 10A jack.
3. Press the MODE button to switch to DC on the display.
4. Remove power from the circuit under test.
5. Open up the circuit at the point where you want to measure the
current.
6. Touch the black test probe tip to the negative side of the circuit
and touch the red test probe tip to the positive side of the
circuit.
7. Apply power to the circuit.
8. Read the current in the display.

Copyright © 2020 Pico Technology Ltd. All rights reserved. 9DO341-1
TA466 Voltage Detector User’s Guide
4.2.6. AC current measurements (frequency, duty cycle)
CAUTION
Do not capture 20 A current measurements for more than 30 seconds. Exceeding 30 seconds
may cause damage to the unit and/or to the test leads.
1. Insert the black test lead into the COMjack(negative).
2. Set the function switch to the required position and connect
the red test lead:
a. For current measurements up to 4000 µA AC: Set the
function switch to the µA position and insert the red test
lead into the µA mA jack.
b. For current measurements up to 400 mA AC: Set the
function switch to the mA position and insert the red test
lead into the µA mA jack.
c. For current measurements up to 20 A AC: Set the function
switch to the 10A position and insert the red test lead into
the 10A jack.
3. Press the MODE button to switch to AC on the display.
4. Remove power from the circuit under test.
5. Open up the circuit at the point where you want to measure
the current.
6. Touch the black test probe tip to the neutral side of the circuit
and touch the red test probe tip to the hot side of the circuit.
7. Apply power to the circuit.
8. Read the current in the display. In the 10 A AC range, the right
auxiliary display will show the frequency.
9. Press and hold the MODE button to switch to Hz.
10.Read the frequency in the display.
11.Press the MODE button again to indicate %.
12.Read the % duty cycle in the display.
13.Press the EXIT button to return to current measurement
14.Press the MODE button to select AC.
15.Press and hold the AC + DC button for two seconds to switch
to AC + DC.
16.Test AC and DC TRUE RMS.

10 DO341-1
TA467 Insulation Tester User’s Guide
Copyright © 2020 Pico Technology Ltd. All rights reserved.
4.2.7. Continuity check
WARNING
To avoid electric shock, never measure continuity on circuits or wires that have voltage on them.
1. Set the function switch to the Ω position.
2. Insert the black lead into the COM jack (negative). Insert the red
lead into the Ω jack (positive).
3. Press the MODE button to switch to and Ωon the display.
4. Touch the test probe tips to the circuit or wire you wish to check.
5. Iftheresistanceislessthan35Ω,theaudiblesignalwillsound.If
the circuit is open, OL will display.
4.2.8. Diode test
1. Set the function switch to the ΩCAP position.
2. Insert the black test lead into the COMjack(negative)andthe
red test lead into the Vjack(positive).
3. Press the MODE button to switch to and Von the display.
4. Touch the test probes to the circuit on either side of the
diode under test. Forward voltage will typically indicate
0.400to0.700V.ReversevoltagewillindicateOL. Shorted
deviceswillindicatenear0Vandopendeviceswillindicate
OL in both polarities.

11
DO341-1
TA467 Insulation Tester User’s Guide
Copyright © 2020 Pico Technology Ltd. All rights reserved.
4.2.9. Capacitance measurements
WARNING
To avoid electric shock, disconnect all power to the unit under test and discharge all capacitors
before you take any capacitance measurements.
1. Set the function switch to the CAPposition.
2. Insert the black test lead into the COMjack(negative)andthe
red test lead into the V jack (positive).
3. Press the MODE button to switch to nF.
4. Touch the test probes to the circuit on either side of the the
capacitor you are testing.
5. Read the capacitance value in the display.
4.2.10. Temperature measurements
1. Set the function switch to the Temp position
2. Connect the temperature probe to the input jacks on the unit
(make sure that you observe the correct polarity).
3. Press the MODE button to switch to °F or °C.
4. Touch the temperature probe tip to the part that you
wish to measure the temperature of. Keep the probe
touchingthepartundertestuntilthereadingstabilizes
(about30seconds).
5. Read the temperature in the display.
Note: The temperature probe is fitted with a K-Type mini
connector. The tool is supplied with a mini to banana adaptor to
connect to the input jacks on the unit.

12 DO341-1
TA467 Insulation Tester User’s Guide
Copyright © 2020 Pico Technology Ltd. All rights reserved.
4.2.11. Frequency (duty cycle) measurements (electronic)
1. Set the function switch to the Hz% position.
2. Insert the black test lead into the COM jack (negative) and the
red test lead into the Hz% jack (positive).
3. Touch the test probes to the circuit under test.
4. Read the frequency on the display.
5. Press the MODE button to switch to %.
6. Read the % duty cycle in the display.
4.2.12. % 4 - 20 mA measurements
1. Insert the black test lead into the COMjack(negative).
2. Insert the red test lead into the µA mA jack.
3. Set the function switch to the 4-20mA% position.
4. Remove power from the circuit under test.
5. Open up the circuit at the point where you want to measure the
current.
6. Touch the black test probe tip to the negative side of the circuit and
touch the red test probe tip to the positive side of the circuit.
7. Apply power to the circuit.
8. The loop current will be displayed as a % with 0 mA=-25%, 4
mA=0%, 20 mA=100% and 24 mA=125%.

13
DO341-1
TA467 Insulation Tester User’s Guide
Copyright © 2020 Pico Technology Ltd. All rights reserved.
4.2.13. Insulation resistance measurements
WARNING
Risk of electric shock during testing. The Insulation tester applies a potential difference (1000 V
DC maximum) across its probe tips during an insulation resistance test. If the LOCK function is
active, this voltage will be present at all times.
WARNING
Insulation testing a powered-up high-voltage system may cause death and damage to equipment.
Safely power down the high-voltage system according to the manufacturer’s instructions and
check for the absence of high-voltage prior to insulation resistance testing.
1. Set the function switch to the Insulation position. Note the voltages in the top left corner on
the display. Press the RANGE button to switch between the available test voltages and select a
suitable voltage range for your application.
2. Connect the black test lead to the Insulation - jack (negative) and connect the red test lead to
the Insulation + jack (positive).
3. Connect the two test leads to the circuit you want to test.
4. You can now continue the test in two different ways:
a. Without the LOCK function
i. Push down and hold the INSULATION TEST button
ii. If the insulation detects a potential difference between the probe tips of less than 30 V
(AC or DC), it will:
1. Display the lightning symbol while the test voltage is applied
2. Display the insulation resistance (in megaohms)
3. Display the achieved test voltage (in VDC) in the top right ocorner of the display
4. Indicate the insulation resistance using the analog bar graph
5. Soundafrequentbuzzerwarning
Otherwise, the insulation tester will not apply a test voltage and will display both > 30 V
 andaflashinglightningsymbolandsoundabuzzerwarning.
iii. Release the INSULATION TEST button
iv. The insulation resistance and achieved test voltage will continue to be displayed for
approximately 20 seconds, although you can push and release the EXIT button within
this period to clear the display and discharge any residual test voltage from the tester.

14 DO341-1
TA467 Insulation Tester User’s Guide
Copyright © 2020 Pico Technology Ltd. All rights reserved.
b. With the LOCK function:
i. Push down and hold the LOCKbuttonfortwoseconds.Abuzzerwillsoundtwiceto
conrmithasbeenactivated.
ii. Push and release the INSULATION TEST button
iii. If the insulation detects a potential difference between the probe tips of less than 30 V
(AC or DC), it will:
1. Display the lightning symbol whilst the test voltage is applied.
2. Display the insulation resistance (in megaohms).
3. Display the achieved test voltage (in VDC) in the display top right corner.
4. Indicate insulation resistance using the analog bar graph.
5. Soundafrequentbuzzerwarning.
Otherwise, the Insulation tester will not apply a test voltage and will display both > 30 V
 andaflashinglightningsymbolandsoundabuzzerwarning.
iv. Push the EXIT button to stop applying the test voltage, discharge any residual test
voltage from the tester, and clear the insulation resistance and the achieved test voltage
from the display.
5. Rotate the function switch to OFF to exit the test. This discharges any remaining insulation test
voltage through an internal switch, which will take approximately two seconds.

15
DO341-1
TA467 Insulation Tester User’s Guide
Copyright © 2020 Pico Technology Ltd. All rights reserved.
Object of the insulation test Note
Power tools and small appliances
(equipment with a line cord)
The main power must be disconnected and the power switch on the
tool/appliance must be in the ON position.
For double insulated power tools, the negative (black) test lead must be
connected to a metal part of the tool (e.g. the chuck or blade).
Motors AC If the motor is disconnected at the motor terminals, connect one test
lead to the grounded motor housing and the other lead to one of the
motor leads.
If the main switch disconnects the motor, and the motor also has a
starter, you must find a way to hold the starter in the ON position.
In measurements of motors with a starter, the measured resistance
will include the resistance of the motor, wire and all other components
between the motor and the main switch.
Motors DC To test the brush assembly, field coils and armature, connect one test
lead to the grounded motor housing and the other test lead to the
brush on the commutator.
The above also applies to DC Generators.
Cables Disconnect the cable from the circuit. Also disconnect the opposite end
to avoid errors due to leakage from other equipment.
Check each conductor to ground and/or cable sheath by connecting
one test lead to a ground and/or cable sheath and the other test lead to
each of the conductors in turn
Check the insulation resistance between conductors by connecting the
test leads to conductors in pairs.

16 DO341-1
TA467 Insulation Tester User’s Guide
Copyright © 2020 Pico Technology Ltd. All rights reserved.
4.3. Auto-ranging/manual range selection
When the insulation tester is first turned on, it automatically goes into Autoranging. This selects
the best range for the measurements being made, which is generally the best mode for most
measurements. For measurement situations requiring a manual range selection, perform the
following:
1. Press the RANGE button once. The AUTO display indicator will turn off.
2. Press the RANGE buttonagaintogothroughtheavailablerangesuntilyoundtherangeyou
want to select.
3. To exit the manual ranging mode and return to Autoranging, press EXIT.
Note: Manual ranging does not apply for the temperature functions.
4.4. MAX/MIN
Press the MAX/MIN button to activate the MAX/MIN recording mode. The MAX icon will appear
in the display. The left auxiliary display will hold the maximum reading and will update only when
a new max occurs. The MIN icon will appear in the display. The right auxiliary display will hold the
minimum reading and will update only when a new min occurs.
To exit MAX/MIN mode press EXIT.
4.5. Relative mode
The relative measurement feature allows you to make measurements relative to a stored
reference value. A reference voltage, current, etc. can be stored and you can make measurements
comparison to that value. The displayed value is the difference between the reference value and the
measured value.
Note: Relative mode does not operate in the 4-20 mA function.
1. Perform the required measurement as described in the appropriate operating instructions.
2. Press the REL button to store the reading in the display and the REL indicator will appear on the
display.
a. The left auxiliary display will show the margin of the initial value and the current value. The
right auxiliary display will show the initial reading. The main display will show the reading
after REL TEST.
3. Press the EXIT button to exit the relative mode.
4.6. Display backlight
Press the key to turn the backlight on. The backlight will automatically turn off after the set time
(see page 19 to learn how to change this setting). Press the button to exit the backlight-on
mode.

17
DO341-1
TA467 Insulation Tester User’s Guide
Copyright © 2020 Pico Technology Ltd. All rights reserved.
4.7. Hold
Theholdfunctionfreezesthereadinginthedisplay.PresstheHOLD key to activate or to exit the
HOLD function.
4.8. Peak hold
The peak hold function captures the peak AC voltage or peak AC and DC current. The unit can
capture negative or positive peaks as fast as 1 millisecond in duration. Press the PEAK button,
PEAK and MAX will display in the left auxiliary display. MIN will display in right auxiliary display. The
unit will update the display each time a lower negative peak occurs. Press the EXIT button to exit
the PEAK HOLD mode.
Note: The auto power-off feature is automatically disabled in this mode.
4.9. Data storage
STORE function:
While being in your chosen testing mode, press the STORE button one time to enter the STORE
function and the setup for the recording interval time function.
The upper left corner shows 0000 S, the recording interval time. Use the +and -buttons to select.
The range is 0 to 255 seconds.
When the recording interval time is set to 0000 S, press the STORE button to change into manual
recording. Press the STORE button again to record. When the recording interval time is set to 1
to 255 S, press the STORE button to start recording automatically from 0000. Recording time is
shown in the upper left corner, data is shown in the upper right corner. Note: The time display is
limited to four digits. To exit the STORE function, press the EXIT button.
For storing insulation measurements:
When the recording interval time is set to 0000 S, press the STORE button to change into manual
recording. While you perform the insultation test press the STORE button to record the displayed
value.
When the recording interval time is set to 1 to 255 S, press the STORE button to automatically start
recording the displayed value at the selected interval while you perform the test. The number of
stored recordings is shown in the upper left corner, data is shown in the upper right corner. Note:
The time display is limited to four digits. To exit the STORE function, press the EXIT button.

18 DO341-1
TA467 Insulation Tester User’s Guide
Copyright © 2020 Pico Technology Ltd. All rights reserved.
4.10. Data storage recall
1. Switch on the meter.
2. Press and hold the STORE button for two seconds to enter into the RECALL function. The upper
left corner will show XXXX, which is the serial number for the current storage. The upper right
corner will show XXXX, which is how much of the storage that is currently in use.
3. Use the +and -buttons to select the required serial number XXXX in the upper left corner and
record the data in the upper right corner.
4. To exit the RECALL function, press the EXIT button.
4.11. Clear all data
1. From the OFF position, press and hold the RANGE button while turning the function switch to
any position.
2. Release the RANGE button. The memory has been cleared.
4.12. PC wireless communication
1. Install and launch the PC software.
2. Switch on the meter.
3. Press and hold the USB button for two seconds to enter RF wireless transmit mode. The RF
icon will appear on the display.
4. When communication is established, the RF icon on the display will blink and the LED indicator
on the receiver will blink.
5. The data will be displayed on the PC screen (plotted on the graph and inserted in the data list)
once every second.
6. Press and hold the USB button for two seconds to exit the RF wireless transmit mode.
7. RefertotheHELPleinthesoftwareformoredetails.
4.13. Sending stored data to the PC
1. Launch the PC software.
2. Switch on the meter.
3. Press and hold the STORE button for two seconds to enter data RECALL function.
4. PressandholdtheHOLDbuttonfortwoseconds.TheRFtransmiticonwillashwhilethe
stored data is sent to the PC.
Note: The time stamp for the transferred data is the time it was transferred, not captured.
Note: Refer to the HELP file included in the software for in-depth software instructions.

19
DO341-1
TA467 Insulation Tester User’s Guide
Copyright © 2020 Pico Technology Ltd. All rights reserved.
4.14. SETUP (SET)
This function allows you to configure the meter and decide on the following settings:
The settings includes (in sequence):
a. upperlimitbuzzeralarm,theunitwillsoundthealarm(“beep”)ifthemeasuredvalueis
greater than the high limit.
b. lowerlimitbuzzeralarm,theunitwillsoundthealarm(“beep”)ifthemeasuredvalueis
lower than the low limit.
c. auto power-off time
d. turn off sound
e. backlight time
Press and hold the SETUP button for two seconds to enter the settings menu. The screen will
display SET on the left display, OFF on the main display and High on the right display. This is the
firstavailablesetting,theupperlimitbuzzeralarm.
To change this setting, press the > button to cycle through the digit placement. Use the
+and-buttonstoselectavalue.Pleasenotethatthissettingdoesnotusedecimals.
Press the <buttontocanceltheupperlimitbuzzer(OFFintheprimarydisplay).
Press the SETUP button to save this setting and move to the next setting in the menu.
Note: In the last three settings you can only use the +and <button to alter the settings.
Note: If you press the EXIT button to cancel while in the settings, you will exit from the menu
without saving any updated settings.
4.15. AC + DC
In any of the following measuring modes, V AC, mV (AC), 10 A (AC), mA (AC), µA (AC), you can
press and hold the EXIT button for two seconds to enter AC + DC testing. The procedure is the
same as with AC measurement. The display will show the AC+DC icon. Press the EXIT button to
exit the mode.
4.16. Low battery indication
When the icon appears alone in the display, you need to replace the battery.

20 DO341-1
TA467 Insulation Tester User’s Guide
Copyright © 2020 Pico Technology Ltd. All rights reserved.
4.17. Maintenance
WARNING
To avoid electric shock, disconnect the test leads from any source of voltage before you remove
the battery cover, the batteries and the rear cover.
WARNING
To avoid electric shock, do not operate your insulation tester until the rear cover and battery cover
are in place and fastened securely.
This insulation tester is designed to provide years of dependable service if the following care
instructions are performed.
1. Keep the unit dry. If it gets wet, dry it immediately.
2. Use and store the unit in normal temperatures. Temperature extremes can shorten the life of the
electronic parts and distort or melt plastic parts.
3. Handle the unit gently and carefully. Dropping it can damage the electronic parts or the case.
4. Keep the unit clean. Wipe the case occasionally with a damp cloth. DO NOT use chemicals,
cleaning solvents or detergents.
5. Useonlyfreshbatteriesoftherecommendedsizeandtype.Removeoldorweakbatteriesso
they do not leak and damage the unit.
6. If the unit is to be stored for a long period of time, the batteries should be removed to prevent
damage to it.
4.17.1. Battery installation
1. Turn the power off and disconnect the test leads from the unit.
2. Lift the stand to access the battery cover.
3. Remove the battery cover by removing four screws (requiring a Phillips head screwdriver).
4. Insert six AA batteries into the battery holder. Observe the correct polarity.
5. Put the battery cover back in place and secure with the screws.
Note: If your insulation tester does not work properly, check the fuses and batteries to make sure
that they are still good and that they are properly installed.
Replacing the fuses
1. Turn the power off and disconnect the test leads from the unit.
2. Lift the stand to access the battery cover.
3. Remove the battery cover by removing four screws (requiring a Phillips head screwdriver).
4. Remove the six AA batteries.
5. Remove the rear cover by removing six screws (requiring a Phillips screwdriver) and carefully
separating it from the front cover. Be aware of the supply wires, you do not want to pull them too
hard. Both fuses should now be easily accessible.
6. Carefully remove the old fuses and install the new fuses.
a. Alwaysuseafuseofthepropersizeandvalue(0.5A/1000Vfastblowforthe400mA
range [SIBA 70-172-40], 10 A/1000 V fast blow for the 20 A range [SIBA 50-199-06]).
7. Put the rear cover, batteries and battery cover back in place and secure with the designated
screws. Make sure you do not trap the supply wires when you put the rear cover back on.